Re: [stella] Star Fire 2600: Star Background

Subject: Re: [stella] Star Fire 2600: Star Background
From: "Andrew Davie" <adavie@xxxxxxxxxxx>
Date: Thu, 1 Aug 2002 20:54:18 +1000
Most impressive, Manuel :)
I've had a brief peek at the code - don't understand it yet, but here's a
couple of things...

    BPL DontSwap            ; Y: All right!
    BPL DontSwap            ; Y: All right!

You have a duplicate line in Flickersort

; Two lines *wasted* with repositioning...
    DEC vline
    DEC vline

Consider instead

    sty vline

The latter takes 7 cycles.  Your current version takes 10 cycles.
Same # bytes, of course.

Anyway, an interesting kernal.  Keep up the good work!

----- Original Message -----
From: "Manuel Polik" <cybergoth@xxxxxxxx>
To: <stella@xxxxxxxxxxx>
Sent: Thursday, August 01, 2002 9:31 AM
Subject: [stella] Star Fire 2600: Star Background

> Hi there!
> Ok, as promised, here's finally a binary with some star
> background, using an adopted technique which I analysed
> by studying the code from Earth Dies Screaming.
> Please ignore the increasing stars flicker towards the
> right edge of the screen, I'll *time* most of that away,
> as soon as I'm done with adding features to the kernel.
> Unlike my first assumption, flicker can't be totally
> avoided, since there's no way to enable the ball during
> a repositioning line.
> I've still a few cycles left (~6 on each line, + one STA
> WSYNC eventually) so I'm positive at the moment about
> having non-mirrored sprites, which'd allow me adding the
> mothership in its original fashion.
> Greetings,
> Manuel

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